Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1991-03-08
1993-10-19
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
345 97, G02F 1133, G09G 336
Patent
active
052551105
ABSTRACT:
An optical modulation device includes scanning electrodes and signal electrodes disposed opposite to and intersecting with the signal electrodes, and an optical modulation material disposed between the electrodes, a pixel being formed at each intersection of the electrodes and showing a contrast depending on the polarity of a voltage applied thereto. The device is driven by a method including, in a writing period for writing in all or prescribed pixels among the pixels on a selected scanning electrode, a first phase for applying a voltage of one polarity having an amplitude exceeding a first threshold voltage of the optical modulation material to the all or prescribed pixels, and a second phase for applying a voltage of the other polarity having an amplitude exceeding a second threshold voltage of the optical modulation material to a selected pixel and applying a voltage not exceeding the threshold voltages of the optical modulation material to the other pixels, respectively among the all or prescribed pixels. The maximum duration of a continually applied voltage of the same polarity applied to a pixel on a scanning electrode is 2.5 times the duration of the first phase in the writing period.
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Inaba Yutaka
Kanbe Junichiro
Kaneko Shuzo
Mouri Akihiro
Toyono Tsutomu
Canon Kabushiki Kaisha
Duong Tai V.
Sikes William L.
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